Thread-stitching machine having a thread layer with two points



May 5, 1925. :1,536,Q6 6

u. sisal- 0 THREAD STITCHING MACHINE HAVING A THREAD LAYER WITH TWO PTOINTS Filed July 21, 1924 2 sheets-sheet 1 May- $12925; 1,536,066

u. BISCHOF 1 TH-READ STIiQHI NG'MAGHINEHAVING A THREAD LAYER ITH 'rwd Pom'rs Filed July 21, 1924 2 Sheets-Sheet 2 Patented May 192'.

lllts UNITED STATE PA ENT OFFICE.

ULRICH BIsGHOF, or? HORGEN, SWITZERLAND, ASSIGNOR 'IO GEBR. 'STAUBLI & 00.,

or HoaGEN, ZURICH, SWITZERLAND;

THREAD-STITGHING MACHINE HAVING A THREAD LAYER WITH TWO POINTS.

" Apphcation filed July 21, 19%v Serial No. 727,377.

T (t7! whom it may ma -g the thread layer the necessary clearance for Be it knownthat I, Umuon BISGHOF, a this movement. citizen of the Republic of Switzerland, re- According to the present invention the siding at I-Iorgen, in the Canton of Zurich, two points of the thread layer are located 5 Republic of Switzerland, have invented cerone above the other and the eye of the tain new and useful Improvements in sewing-needle forming the tying off loop llhreadfititching Machines Having a lies lower than the eye of the first needle, Thread Layer with Two Points, of which. while the point of the thread-layer, which the following is a specification. catches the tying off loop, passes below the 10 In thread-stitching machines of the type eye of the first needle, when the loop of having a thread layer with two points each the stl l is f rm y he o her point. stitch is tied off by a separate thread and By this arrangement books, the length of i th drawn tight. the back of which is only a few centimeters,

In the well-known thread stitching maay be bound on the mee'hihe Since, he Wm chines of thg is effected be descrlbed below, the CllSllrlIlCG between in various ways. In such machines the adleeeht heedtee d y he h thread layer used. for this purpose is prog t r than the Wldth the thread layer vided with two points lying one behind the the eeeelhpehylhg re s three other in the direction of motion of the e h e p of the lhlehtloh are 30 thread layer, which are so arranged that the llhletl'itteth 111 Whleh point, which catches the tying oil loop, lies ig. 1 ShOWS the thread layer of the first I .in front of the first sewing-needle, when the example in front elevation, side elevation thread layer is in its initial position. It is nd plan v w, obvious, that for stitching with such an ar- Figs. 24; show various stages of the stitchlangen'ient the needles must be placed relaing operation as performed with the mechalively far apart andythat consequently nism according to the first example, with 90 books, which, after being stitched, are cut the threz-iddayer in various positions, into two to six separate books, the length Figs. 7-8 each show a machine with two of the back of which is only a few cen'tithread layers (second and third example) meters in length (waistcoat pocket size),, and

cannot be bound on machines of this kind, Figs. 9--l0 show the stitches made with as the position of the stitches should in th 15 -1; tw maehines such small books he correspondingly close 1 i th th d layer ith th t i t together. I11 addition t0 this the needles 2 and 3 lying one above the other 4 is the 35 and the thread layers frequently break, as t bl Sthe sheets to be bound, 6 the fir the sewing-needle at the commence n f needle, 7 the second needle and 8 the hooked the stitching operation must move down beneecua v tween the tWO Points Of the thread layer Befgre the coinmencemnt of the ewing and, even when there is only a slig operation the thread layer occupies the posiamount of play or bending in the members at, Shown i Fi 2 i 1 01, ll llth'lllg lillU SlillChGS, there it danger On the hep t3 5 oo ning undgp the ncgdles ()ll lillG llQO/(HQ striking against (H19 (ll: lillf", fh g pierce, the gu d there; points. upon more back again. a short distance in a n In other known types of thread stitching known .rnanner for forming the loop. The

machines the thread layer performs asinall thr w] layer is thereupon moved to the left turning movement about its longitudinal (Fig. 3) and the upper point 2 of the same axis in addition to the longitudinal motion enters the loop in the thread formed during for the purpose of catchingthe loop inthe the said return motion of the needle 6, while thread, in which case there is the danger the lower point 3 passes below the eye and that, during the turning movement of the the loop of the needle 6 which lies higher thread layer, the point of the same may not than the eye of the needle 7. On the thread catch the loop. For making this turning layer continuing its forward motion, the

movement of the thread layer possible an loop, which has been caught by the point 2,

opening is provided in the table, for giving is drawn ont, whereupon both points enter the loop 9 formed during the piercing and return motion of the needle 7 (Fig. 5) or the loop carried by the point 2 is drawn through the tying up loop drawn out by the point 3, which is in advance, and is thus embraced by the said latter loop. During the continued motion of the thread layer both loops are drawn out beyond the hooked needle 8 (Fig. 6). whereupon by a slight turning motion of the thread layer perpendicularly to the plane of the drawing towards the observer, that part of the thread of the stitch loop lying in front of the thread layer is carried towards the hooked needle and placed over the hook of the same. On the needles rising the loop forming the stitch, which is held by the point 2, is drawn in a known manner tlirough the back of the book to the outside, while the loop held by the point 3 embraces the other loop inside the sheet. The thread layer thereupon returns into the position shown in Fig. 2, whereupon the thread-tightening device (not shown) gradually draws up the threads, which are released, on the return motion of the thread layer taking place, and finally pulls the stitch tight, whereby the tying up loop, which is also released by the thread layer, is also drawn tight.

In Figs. 1-6 it is assumed, that the machine has only one thread layer.

In Figs. 7'8 is assumed, that each machine has two thread layers. According to Fig. 7 the thread layers, when in the position corresponding to that of Fig. 6 are betweei'i two groups of needles, while according to Fig. 8 the thread layers are each on the sanieside (to the right in the drawing) next to the corresponding group of needles. In the exainple shown in Fig. 7 the thread layers move in opposite directions during the stitchii'rg oi'i'era'tion and in the example shown in Fig. 8 in the same direction. In both. cases the position of the parts shown in the drawing corresponds to that shown in Fig. '6 and the sheets after being stitched, are cut apart by hand or by mechanical means between the two groups of" stitches.

Fig. 7 shows a constructional example with thread layers working to the right and left and with the needles inv the corresponding positions.

As will be seen from Fig. 8 the minimum distance A between two groups of stitches for a book, which is absoliitely necessary for the operation of the thread layer is only slightly greater than the breadth of the thread layer, whereby it is possible to place the stitches close together as required in the case of small books, so that 2-6 books, the length of which is only small, can be sewn in one piece on the machine and be subsequently cut apart to form separate books.

As already stated, in the constructional examples shown, the point 3, which catches the tying oil loop, can pass clear under the eye of the first needle, as the said eye is placed somewhat higher to correspond to the amount by which one point on the looper higher than the other point.

Fig. 9 shows the finished sewing corresponding to the constructional examples shown in Fig. 7, and Fig. 10 that correspond ing to the constructional form shown in Fig. 8, both of which will be understood from what has been stated above.

Instead of two thread layers being provided in each machine, as shown in Figs. 7 and 8, a greater number of thread layers might beproyided.

W hat I claim is In a thread stitching machine, the combination with eyed sewing needles and a hooked needle, of atliread layer with two points one of which lies above the other, the eye of one of the sewing needles being adapted to i'orn the tying oif loop and being lower than the eye of the other needle, and one of the points of the thread layer being adapted to catch the tying o'tl loop and to pass under the eye 01 the first needle, when the loop of the stitch is formed.

In testimony whereof, I have affixed my signature in presence of two witnesses.

ULRICH BISCHOF.

\Vit'nesses niiiu ANN III} BER, Non. lIhUBiin. 

